Grinding apparatus



11,455,2&6

R. E. FOSDICK GRINDING APPARATUS May 15, 1923.

Filed Sept.

3 Sheets-Sheet l May 15 R. E. FOSDICK GRINDING APPARATUS l920 5 Sheets-Sheet 2 Filed Sept. 10

May 15, I923.

455,286 R. E. FOSDICK GRIND]; NG APPARATUS Fil ed Sept. 10 1920 3 Sheets-Sheet 3 Patented May 15, 1923.

urren STATES l P l ROBERT E. FOSDICK, OF CINCINNATI, OHIO.

GRINDING APPARATUS.

Application filed September 10, 1920. Serial No. 409,318.

To all whom it may concern:

Be it known that I, ROBERT E. FosDIoK, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Grinding Ap paratus, of which the following is a specification.

My invention relates to improvements in grinding mechanism. One of itsobjects is to provide improved grinding mechanism adapted to grind and bevel glass panels, mirrors, and similar objects. Another object is to provide means to automatically feed the object to be ground so as to pro-, duce true, symmetrical objects so as to obviate the irregular reflection of light. Another object is to provide improved means to hold the object to be ground without injury thereto. Another object is to provide improved means to holdv the ob ects to be ground to avoid breakage thereof, and to provide for their rapid and convenient ap plication and removal from the hold ng means. Another object is to provide 1111 proved means to adjust the grinding means to grind objects at different angles. An-

7 other object is to provide improved driving and feeding mechanism.

My invention also comprises certain detailsof form combination and arrangement, all of which will be fully set forth in the description of the accompanying drawings, in which: i

Fig. 1, is a side elevation of my improved apparatus,

Fig.2, isa front elevation of the same,

Fig; 3, is a side elevation ofa finished article to be ground upon my improved apparatus. r

Fig. 4, is a plan of' the article of Fig. 3,

Fig. is a central vertical section through the chuck or holding apparatus andits feeding mechanism on line-55 of Fig. 6.

F ig.u 6, is a plan view of the chuck and feeding mechanism detached.

Fig. 7, is a front elevation of the chuck and feeding mechanism with the gear housing cap. removed.

Fig. 8, is a. plan of the face of one of the detachable chucks.

Fig. 9, is a section through said chuck on line 9.-9 of Fig. 8. i

i Fig. 10 is a side elevation partly in section on line 10.10 ofFig. 2.

The accompanying drawings illustrate the preferred embodiment of my invention in which 14 represents the main frame of the apparatus adapted to be rigidly mounted upon a bench or pedestal. A shaft 15 is journaled to said frame and provided with an abrasive wheel, 16 and a belt pulley 17 and adapted to be driven at a relatively high rate of speed by means of a belt 18. A. tray 19 is preferably provided attached to the frame 1d and supplied with water into which the lower portion of the periphery of the abrasive wheel dips.

A shaft 20 is journaled in frame 14: and is driven from the shaft 15 at relatively slower speed by means of a pair of spiral gears 15 and 20 respectively mounted on the shafts 15 and 20. The spiral gear 20" is loosely mounted on the shaft 20, and a clutch member 90 splined on shaft 20 and movable endwise thereon by hand lever 22 serves to clutch gear 20' to shaft 20. A cam 92 on shaft 20 and in the housing 23' serves to rock a lever 93 carrying a pin 94: engaging an annular groove in a collar 95 on shaft 15 to slowly move the shaft 15 a short distance endwise carrying the wheel 16 therewith to avoid uneven wear at the active face of wheel 16. The gear 21 meshes on shaft 20 with and drives a spiral gear 24 on the shaft 25, which shaft journals in bearings 26 forming part of the frame 14. Also loosely journaled upon the shaft is a swinging frame 27 One section of the frame 27 forms a. journal for a shaft 28 while the opposite section of frame 27 has journaled therein a sleeve 29, through which is threaded a rod 30, provided at its inner end with a face plate 31, and at its outer end with a hand wheel 32. The sleeve 29 is provided with a spiral gear 29 meshing with and driven by the gear 24. A gear 33 of the same pitch diameter as gear 24, mounted on the opposite end of shaft 25, meshes with a gear 34: on the shaft 28, whereby the shafts 28 and 29 are driven at the same speed and in the same direction.

A series of roughly dressed sheets or disks of stock 35 such as sheet or plate glass are united at their faces by an adhesive and then clamped between the end ofshaft 28 and the face plate 31 so as to be slowly revolved while their edges are applied to the face of the wheel 16 by means of a spring arm 96 attached at one end to the frame 27 Ill) and at its opposite end bearing against the frame 14. The frame 27 is resiliently pressed toward the wheel 16 to yieldingly press the stock 35 against the wheel. A micrometer screw 36 is adjustable as a stop in the path of a portion of the frame 27 to limit the feed of the stock toward wheel 16 and thereby to secure finished articles of predetermined and uniform diameter. A hand wheel 37 on shaft 20 provides for adjusting the stock holding mechanism by hand to insert and remove the stock. The gear 33 also meshes with a gear 38 on a shaft 39 journaled to the frame 14 and at its opposite end provided with a beveled gear 40.

A beveled gear 41 on the shaft 42 meshes with the beveled gear 40. The shaft 42 is journaled to the frame 14 and at its opposite end is provided with a beveled gear 45 driving beveled gear 46 mounted upon the shaft 47 extending horizontally across and journaled to the frame 14. The frame 14 is rovided with ways 48 parallel to and adacent to shaft 47 to guide a carriage 49 transversely of the frame 14 and along the axis of the shaft 47. A spindle housing and bearing 50 is rotatably mounted in bearings 51 and 52 of the carriage 49.

A spiral gear 53 is splined to the shaft 47 and travels with the carriage 49, and drives a spiral gear 54 on a shaft 55 which is journaled in bearings in the housing 50. The shaft 55 carries a beveled gear 56 which drives a beveled gear 57 rigidly mounted upon the chuck spindle 58 The chuck spindle is journaled in bearings 59 and 60 in the housing 50. A face plate 61 is detachable from the housing 50 to give access to the interior of said housing. The gear 57 is rigidly attached to the spindle by means of a set screw 62 to facilitate detachment or adjustment of the spindle. Above gear 57 on the spindle is a loose spacing sleeve 63, and above the journal bushing 59 is a packing or stufling box 64 with a long follower or gland 65 held in place by a nut 66, threaded to the housing 50 and with a packing washer67 interposed. The spindle 58 is hollow, and is connected with a pneumatic suction pump or other means 7 O to maintain a vacuum in the interior of the spindle.

The lower end of spindle 58 is tapered exteriorly and internally in order that a series of chucks 7 0 of the general type shown in Figs. 8 and 9 and of difierent sizes may be conveniently applied to the tapered end of the spindle to be held hereon with an air tight joint. The faces of the chucks are provided with an annular face 71, preferably of rubber or other slightly yielding material adapted to form an air tight joint with the face of one of the stock members 35 when the air cock 69 is opened, to thereby hold the stock member firmly in place upon the face of the chuck without liability to scratch or injure the polished face of the stock member, and to instantly release the stock member as soon as the cock 69 is closed and the vacuum in the chuck and spindle is relieved. Inside of the annular faces 71 of the chucks are countersunk recesses 72 communicating with the hollow spindle to provide for a sufficient application ofvacuum pressure to the rear face of the stock members to firmly hold the stock members to the chucks. In the larger chucks I also preferably provide a series of supporting faces 73 projecting up from the countersunk recessflush with the annular face 71 and preferably of yielding material to locally support the rear face of the stock member at sufficiently frequent intervals to prevent cracking or injuring the stock members, due to excessive vacuum pressure, exerted thereon over an extended area.

In practice the stock members 35 are first placed between the center-s28 and 81 and a number of them trued up on their edges, and then taken separately and applied concentrically to the face of the chuck to have a true beveled face 75 ground thereon. The housing 50 and spindle 58 are adjustable relative to the carriage 49 upon the axis'of the shaft 55 with reference to the face of the wheel 16 to grind a beveled face of any predetermined degree of angularity, and the carriage 49 is adjustable along the ways and the spindle 58, after releasing the set screw 62, is adjustable endwise into or out of the housing 50 to bring the stock into operative relation with thewheel 16 for grinding any desired degree of angularity.

A plate 76 and post77 project upwardly from the carriage 49 and a spring 78 connected at one end'to thehousing 50 is adjust-ably connected by a short section of chain 79 to the post 77'to yieldingly force the stock members 35 into engagement with the face of the wheel 16. The plate 76 has a series of openings 80, spaced for instance ten degrees apart, into any one of which a stop pin 81 may be inserted. The stop pin 81 is in the path of and adapted to be en gaged by the end of a micrometer screw82, to provide for a positive stop or limitation of the action of the spring 78 when the stock section has been ground to the prescribed angle. A hand wheel 83, shown on Fig.2, but omitted from Fig. 1," is employed to tilt the frame 27 on'its axis to shift and hold the stock members 35 out of contact with the wheel 16 when so desired.

In practice it is practically impossible in grinding glass panels or disks such as shown, to avoid particles of abrasive material from adhering to the moist surface of the stock, and it'is difficult to hold the stock members in grinding, by hand or otherwise without injuring or scratching the already polished surfaces thereof, hence my improved vacuum actuated. chuck lends itself particularly to the accurate, safe, and rapid holding and releasing of such ;stock members with a minimum liability to scratch, break or injure the stock, and enables true and accurate Work to be done, and true and uniform reflection of light through and fromthe beveled faces after theyhave been.

ing the rear face ,of the stock members and distributing the vacuum pressure over relatively large areas, the chucks are adaptable to the firm holding of either thick or thin sheets of stock Without liability of breaking the same.

The apparatus herein illustrated and described is capable of considerable modification without departing from the principle of my invention.

What I claim is:

l. A grinding apparatus:comprising a rotary abrasive Wheel, a frame-adjustable to and from said Wheel and provided Witha pair of centers adapted to hold a plurality ofstock members and to. present the edges of each of said stock members to said abra' sive Wheel, means-to rotatably feed said centers to present fresh surfaces of the stock members to the wheel until the stock members have reached predetermined dimensions, a chuck housing having arotary adjustment and a sliding adjustment, a chuck rotarily mounted on saidchuck housing and adapted to successively hold single stock members at one end thereof and adjustable to present an edge of the stock at a predetermined angle to the action of the abrasive wheel, and a driving train common to both of said chucks to rotate said chuck to feed fresh surfaces of the stock to said Wheel until the stock members have respectively reached predetermined dimensions.

2. A, grinding apparatus comprising a rotary abrasive Wheel, a frame adjustable to and from said wheel and provided With a pair of centers adapted to hold a plurality of stock members and to present the edges of each of said stock members to said abrasive wheel, means to rotatably feed said centers from the shaft of said abrasive wheel to present fresh surfaces of the stock members to the wheel until the stock members have reached predetermined dimensions, a chuck housing having a rotary adjustment and a sliding adjustment, a chuck mounted on said chuck housing, means to maintain a partial vacuun'i between the chuck and one of the stock members to hold the stock member in place on the chuck, said chuck being adjustable to present an edge of the stock at a predetermined angle to the action of the abrasive wheel and means to rotate said chuck fronr the shaft of said abrasive wheel through a driving train common to both of said chucks to feed fresh surfaces of the stock to said wheel until the stock members have respectively reached predetermined dimensions.

3. Agrinding apparatus comprising a rotary abrasive wheel, a frame adjustable to andfrom said wheel and provided with a pair of centers in substantial alignment adapted to hold a plurality of stock mem bers and to present the edge of each of said stock members to said abrasive wheel means to rotatably feed said centers from the shaft of said abrasive Wheel to present fresh surfaces of the stock members to the abrasive wheel until the stock members have reached predetermined dimensions, a chuck housing having a rotary adjustment and a sliding adjustment, a chuck rotarily mounted upon said chuck housing and adapted to successively hold single stock members at one end thereof and adjustable to present an edge of the stock at a predetermined angle to the action of the abrasive wheel and means to rotate said chuck from the shaft of said abrasive wheel through a driving train conr mon to both of said chucks to feed fresh surfaces of the stock to said abrasive wheel until the stock members have respectively reached predetermined dimensions. I

4. A grinding apparatus comprising a main frame, a horizontal rotary abrasive wheelshaft provided with an abrasive wheel journaled to said frame, a chuck housing carriage mounted in horizontal ways on saidmain frame to travel substantially par allel to the axis of the abrasive wheel shaft, a horizontal feed shaft driven from said abrasive wheel shaft and rotatably mounted upon said main frame to pass through said chuck carriage, a chuck spindle housing rotatably mounted horizontally and transversely to said feed shaft and driven by said feed shaft upon said chuck carriage, a chuck spindle rotatably mounted in said chuck housing, a chuck on one end of said spindle adapted to successively hold stock members, and adjustable upon said chuck carriage to present the edge of said stock members at a predetermined angle to the action of said abrasive wheel until the stock member has reached a predetermined dimension.

5. A grinding apparatus comprising a main frame, a rotary abrasive wheel shaft provided with an abrasive wheel journaled to said frame, a chuck housing carriage mounted in ways on said main frame to travel substantially parallel to the axis of the abrasive \vheel shaft, a feed shaft driven fromsaid abrasive wheel shaft and rotatably mounted upon said main frame to pass through said chuck carriage, a chuck spindle housing rotatably mounted transversely to said feed shaft and driven by said feed shaft upon said chuck carriage, a chuck spindle rotatably mounted in said chuck housing, a chuck on one end of said spindle adapted to successively hold stock members, interengaging stop members on said chuck carriage and chuck housing to limit the movement of said chuck housing and means to yieldingly hold said stop members in engagement, said chuck housing being rotatably adjustable relative to said chuck carriage to present the edge of said stock member at a predetermined angle to the action of said abrasive wheel until the stock member has reached a predetermined dimension.

6. i1 grinding apparatus comprising a supporting frame, a shaft journaled to said frame and provided with an abrasive wheel, achuck carriage adjustable relative to said abrasive wheel upon ways on said supporting frame, a chuck housing rotatably mounted relative to said chuck carriage, a

chuck spindle journaled in said chuck carriage a chuck mounted upon said chuck spindle and provided with a recess to form with a stock member a chamber adapted to be partially exhausted to hold the stock member to the face of the chuck through the grinding operation, said chamber being subdivided by local supports for the rear-face of the stock member into relatively narrow channels to avoid liability of fracturing the stock members due to a vacuous strain over an extended area of the stock members.

7. A grinding apparatus comprising a supporting horizontal frame, a shaft journaled to said frame and provided with an abrasive wheel, a chuck carriage-adjustable relative to said abrasive Wheel upon ways on .said supporting vframe, a horizontal spindle driving'shaft journaled to said supporting frames parallel to said chuck carriage ways and driven from said abrasive wheel shaft, a chuck housing rotatably mounted upon said chuck carriage, a chuck spindle ournaled in said housing and driven from said spindle driving shaft, a chuck mounted upon saidchuck spindle and rotatably adjustable with said chuck housing and spindle to swing stock members into and out of engagement with said abrasive wheel, interengaging stops on said chuck carriage and said chuck housing to p'redes termine the limitof movement of said chuck housing, and means to yieldingly draw said stop members into engagement.

8. A grinding apparatus comprising a supporting frame, an abrasi've'wheel, a horizontal driving shaft upon which said wheel is mounted journaled upon said frame, a carriage mounted and adjustable along horizontal ways on said frame above said abrasive wheel, a chuck spindle housing rotatably adjustable upon and-relative mama carriage, achuck spindle journaled to said chuck spindle hou'singand adjustable endwise, relative to said housing, a chuckrigidly mounted at one end of said spindle and adapted to hold successive stock members and to present them downwardly to the action of said abrasive wheel, and a train of gears from said driving shaft to said spindle to rotate said spindle at a relatively slower rate of speed to present fresh surfaces of the stock members successively to the action of'said abrasive Wheel.

signature.

ROBERT E. FOSDICK. 

